Interpretive Summary: Three types of "electronic noses" are compared and contrasted for their ability to differentiate various orange juices. Electronic noses use sensors and advanced statistics to obtain a "fingerprint" for a sample and can then discriminate between different types of samples. The separation of the different classes were similar for all three instruments, with one being significantly better. Each system has advantages and disadvantages and these will be discussed along with the multivariate statistics used to achieve the separation.

Technical Abstract:
A mass spectrometer based electronic nose system is compared to a metal oxide semiconductor (MOS) system and a gas chromatograph for differentiating not from concentrate orange juices. Five not from concentrate and one from concentrate juices were analyzed. The separation of the different classes were similar for the MOS and gas chromatograph systems. The mass spectrometer based unit appears to have superior separation based on preliminary results. Each system has advantages and disadvantages and these will be discussed along with the multivariate statistics used to achieve the separation.